Although any storage enclosure that’s dedicated to a single server can be named DAS, the units we list right here have the distinction of a built-in RAID controller. These were all-natural physical resources for virtual machines (VMs), and so our original single-server, single-OS machine became, in effect, eight servers operating eight OSes but nonetheless in a single enclosure. In other words, our fancy SAN supplies complete virtual drives more than the network — which is a major contrast with a NAS that simply supplies virtual folders more than the network.
Chapter 4 compares the subsystem architecture utilized by each and every key enterprise storage vendor. Amongst readily available NAS designs, only the Auspex 4Front NS2000 (Auspex NetServer 2000) series of content material servers utilizes each approaches, producing it the most advanced NAS item design and style out there. Considering that we already described the Dell MD1220 above, we can appear at its equivalent NAS form issue.
This contrasts in comparison to a DAS (straight attached storage) device which is committed to the pc it directly connects to. The disk arrays in both NAS and DAS are equivalent in function and operation, meaning you can make similar RAIDS and partition designs on each.
The SAN still existed but was now crafted from an person server’s DAS as an alternative of current as a discrete storage array. Although DAS is not connected to a network it can still be utilized by numerous systems as long as each server or laptop has a separate connection to the storage device.
That’s the incredibly elegant style where you shove in as several challenging drives as feasible, turn it on, hope it performs, and pray Western Digital invents a Petabyte really hard drive ahead of you ever have to gracefully deal with this storage problem once again.